reset ipad air 2

First:

If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support

Then:

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

Be certain your daughter has her own Apple ID, regardless of her age.

What does “without a password” mean? Some possibilities:

• You don’t know the Apple ID password of the previous owner. This iPad is therefore Activation Locked.
• You don’t care to use the iPad’s current passcode.
• You want to set up the iPad to not use a passcode once reset.